The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. Why not try and solve them ahead of time?
Diamonds in Python in chars. Achievements Cheevos Holes Languages Medals Miscellaneous All Holes 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Calendar Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz Continued Fractions CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Multitap Input Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Alphabetic Numbers Apéry’s Constant Binary Lambda Calculus Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial All Languages ><> ALGOL 68 ArkScript Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig 05AB1E APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Lily Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Bytes Chars Scoring Bytes Chars Language All ><> ALGOL 68 ArkScript Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig Experimental Language 05AB1E APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Lily Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Hole All 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Calendar Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz Continued Fractions CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Multitap Input Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Experimental Hole Alphabetic Numbers Apéry’s Constant Binary Lambda Calculus Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial # Golfer Points Chars Time Submitted 240th Espiobest 487 115 10ms 26 Feb 2021 240th amollberg 🇸🇪 487 115 11ms 21 Jan 2022 240th weeble 487 115 10ms 23 Dec 2024 244th msrawson 483 116 10ms 6 Aug 2018 244th SimonPeatman 483 116 10ms 2 Feb 2019 244th bob-th 483 116 11ms 26 Aug 2022 244th NerdyMcNerd42 483 116 10ms 4 Feb 2023 244th randolchance 483 116 9ms 5 Feb 2023 244th Mathrew2012 483 116 10ms 9 Nov 2024 244th Emutis 🇱🇹 483 116 10ms 19 Sep 2025 244th 77Tigers 483 116 10ms 14 Jan 2026 252nd ian-h-chamberlain 🇺🇸 479 117 9ms 29 Dec 2019 252nd georgehulme 479 117 10ms 7 Oct 2022 252nd yuchuehw 479 117 11ms 10 Jan 2024 252nd adamnielson42 🇺🇸 479 117 15ms 30 Jan 2025 256th JVerwolf 475 118 9ms 24 Aug 2021 256th PaulMWeiser 475 118 9ms 28 Feb 2023 256th PickausernamePi 475 118 10ms 28 Sep 2023 256th robin-scragg 475 118 10ms 3 Oct 2025 256th Andrey2001 475 118 10ms 3 days ago 261st zdzc 471 119 9ms 25 Apr 2019 261st lukasthaler 471 119 9ms 11 Sep 2020 261st cefqrn 471 119 10ms 20 Dec 2022 261st Jacob385 471 119 10ms 9 Apr 2024 261st sjrct 471 119 10ms 5 Aug 2024 261st zgialor-lab 471 119 10ms 16 days ago 267th ludwig-n 467 120 10ms 4 Apr 2020 267th andre-lameirinhas 🇵🇹 467 120 18ms 4 Nov 2020 267th Bobini1 🇵🇱 467 120 10ms 10 Feb 2022 267th zwxzwxzwx21 467 120 10ms 30 Jan 2024 267th julian-hoelz 467 120 10ms 21 Sep 2024 267th sciencedjinn 467 120 10ms 8 Nov 2024 267th RaBa21 🇭🇺 467 120 9ms 19 Jul 2025 274th dymowski 463 121 10ms 10 Sep 2019 274th matty3 463 121 10ms 26 Aug 2021 274th LeeCamp 463 121 10ms 20 Dec 2021 274th OppositeShark 463 121 10ms 19 Jul 2022 274th Wildst 463 121 9ms 2 Nov 2022 274th jacksonhenry3 463 121 10ms 2 Dec 2022 274th Vaekor 463 121 9ms 27 Feb 2024 274th aaa123git 463 121 10ms 17 Jul 2024 282nd TheAristos 459 122 10ms 21 Oct 2019 282nd danielwang5 459 122 12ms 1 Aug 2020 282nd mateusz-sterczewski 459 122 10ms 7 Nov 2024 282nd qwertzguy 🇫🇷 459 122 10ms 25 Mar 2025 282nd Code-Coder-coder 459 122 11ms 11 Oct 2025 287th Malin001 455 123 9ms 4 Jan 2020 287th argusdusty 🇺🇸 455 123 14ms 31 Dec 2020 287th myleopard 455 123 10ms 13 Oct 2021 287th nullie 455 123 10ms 7 Jun 2022 287th RandGuy 455 123 11ms 22 Nov 2022 287th AstroOrbis 455 123 10ms 9 Feb 2026 293rd fynnkroeger 452 124 9ms 22 Jan 2021 293rd NicoAdams 452 124 10ms 21 Dec 2021 293rd nstearns96 🇬🇧 452 124 10ms 12 Jan 2023 293rd aalec 452 124 10ms 21 Apr 2024 293rd Alban-Boissard 452 124 10ms 14 Jun 2025 298th guliyevemil1 🇦🇿 448 125 10ms 30 Jan 2021 298th martinnorling 🇸🇪 448 125 9ms 14 Feb 2022 298th mrxz 🇳🇱 448 125 10ms 23 Jun 2024 298th RedzGoose 🇦🇺 448 125 10ms 14 Oct 2024 298th ffelixm 448 125 10ms 1 Jun 2025 298th TheSecondComing123 448 125 10ms 26 Feb 2026 304th ValdeQwerty 444 126 10ms 10 Jun 2020 304th bryan15 444 126 11ms 26 Aug 2021 304th bthalheim 444 126 9ms 8 Sep 2022 304th MaxElf999 444 126 9ms 27 Sep 2022 304th quarl 444 126 9ms 12 Nov 2024 309th celynw 441 127 13ms 4 Aug 2020 309th krcs 🇵🇱 441 127 9ms 25 Dec 2021 309th jm600 441 127 9ms 15 Apr 2022 309th msbranicky 441 127 10ms 5 Jul 2023 313th PFischbeck 438 128 10ms 13 Jun 2018 313th mossprescott 438 128 11ms 10 Jan 2023 313th Player01osu 438 128 10ms 29 Oct 2023 316th midnattssol 🇸🇪 434 129 9ms 27 Jul 2023 316th smokestacklightnin 🇺🇸 434 129 11ms 17 Dec 2023 318th 130N35 431 130 9ms 28 Jan 2020 318th PhysicDev 🇫🇷 431 130 11ms 19 May 2021 318th mbittner20 431 130 9ms 27 May 2023 First Prev 241–320 of 597 Next Last
